| distance | reference number | name | latitude | longitude |
| 21.9 | 503 | Chain Bridge, Washington, D.C. | 38.9333 | -77.1167 |
| 23.0 | 502 | Chain Bridge, one mile below, Washington, D.C. | 38.9167 | -77.1 |
| 24.2 | 1495 | Key Bridge, Washington, D.C. | 38.9 | -77.0667 |
| 24.7 | 273 | Bladensburg, Anacostia River, Maryland | 38.9333 | -76.9383 |
| 25.8 | 233 | Benning Bridge, Anacostia River, Washington, D.C. | 38.9 | -76.9667 |
| 26.3 | 3268 | Washington, Potomac River, D.C. | 38.8733 | -77.0217 |
| 27.0 | 59 | Anacostia Bridge, Anacostia River, Washington, D.C. | 38.8667 | -77 |
| 27.5 | 2509 | Reagan National Airport, Washington, D.C. | 38.85 | -77.0333 |
| 28.5 | 222 | Bellevue, Washington, D.C. | 38.8333 | -77.0333 |
| 29.8 | 1825 | Middle Branch, Patapsco River, Baltimore Harbor, Ma | 39.2667 | -76.6333 |
| 30.5 | 35 | Alexandria, Virginia | 38.8 | -77.0333 |
| 32.7 | 969 | Fells Point, Baltimore Harbor, Maryland | 39.2833 | -76.5833 |
| 33.1 | 137 | Baltimore (Fort McHenry), Maryland | 39.2667 | -76.5783 |
| 35.4 | 1041 | Fort Washington, Maryland | 38.7167 | -77.0333 |
| 35.4 | 2553 | Riverview, Maryland | 38.7167 | -77.0333 |
| 36.0 | 1903 | Mount Vernon, Virginia | 38.7 | -77.0833 |
| 36.1 | 1251 | Hawkins Point, Patapsco River, Maryland | 39.2083 | -76.5333 |
| 36.5 | 494 | Cedar Point, Severn River, Virginia | 39.0667 | -76.5667 |
| 37.0 | 1767 | Marshall Hall, Maryland | 38.6833 | -77.1 |
| 37.0 | 1019 | Fort Carroll, Patapsco River, Maryland | 39.2167 | -76.5167 |
| 37.9 | 1183 | Gunston Cove, Virginia | 38.6667 | -77.1333 |
| 38.8 | 1271 | Hills Bridge (Route 4), Maryland | 38.8 | -76.7167 |
| 39.1 | 335 | Brewer Point, Severn River, Maryland | 39.0333 | -76.5333 |
| 40.0 | 1106 | Gingerville Creek, Maryland | 38.9667 | -76.55 |
| 40.5 | 880 | Edgewater, South River, Maryland | 38.95 | -76.55 |